A Guide to Understanding Lehmann Discontinuity
The Lehmann discontinuity is marked by an abrupt increase in seismic wave velocity. It occurs at depths of about 200 km (137 mi) from the
Discontinuities
Mohorovicic Discontinuity: The Crust-Mantle Boundary
The Mohorovičić (Mo‐HOR‐o‐VITCH‐itz) discontinuity is a boundary between the Earth’s crust and the upper mantle. An abrupt increase or jump in seismic wave velocity marks